Leak Saver Direct Inject AC Leak Sealer for HVAC up to 5 Tons — Works with R410A/R134a, No-System Disassembly

Leak Saver Direct Inject AC Leak Sealer is a ready-to-use HVAC additive that permanently seals small refrigerant leaks in most air conditioning and refrigeration systems up to 5 tons.

Designed for technicians and savvy homeowners alike, this formula circulates through the refrigeration loop to find and seal pinholes and small cracks without requiring system replacement. It works with nearly every refrigerant and most system types (automotive and residential excluded only for ammonia systems), installs quickly through standard service ports, and is manufactured in the USA.

How does Leak Saver stop a refrigerant leak without disassembling the system?

The sealant contains reactive molecules that travel with the refrigerant and become active when they encounter air and moisture at a leak site, forming a durable polymer plug. It is intended for small leaks where the system still retains most of its charge within seven days.

• Circulates with refrigerant to locate leak sites automatically
• Reacts at the leak with air/moisture to form a permanent seal
• Best for pinholes and small cracks—large ruptures require mechanical repair

Which systems and refrigerants are compatible with this product?

Leak Saver is formulated to be compatible with a broad range of HVAC and refrigeration equipment, including central A/C, heat pumps, ductless mini-splits, commercial refrigeration, and most automotive systems. It works with common refrigerants such as R410A, R22 (and many replacements), R134a, R1234yf and others—excluding ammonia-based systems.

• Safe for R410A, R134a, R1234yf, R404A, R290, R600a and many more
• Useful in residential, commercial, and automotive HVAC applications
• Not for ammonia systems (industrial NH3)

What tools or adapters are needed to install Leak Saver?

Installation is straightforward: inject the sealant directly into the refrigerant line using a standard manifold gauge set or the Leak Saver Leak Shot Injection Kit for added convenience. Automotive and certain mini-split systems require a simple adapter to match the service port size before injection.

• Works with manifold gauges, hoses, and standard service tools
• Automotive systems need a 134A to 1/4" charging adapter
• Mini-splits may require a 5/16" to 1/4" adapter

Is Leak Saver safe for system components and future servicing?

The formula is designed to be non-damaging to service components including gauges, hoses, expansion devices (TXVs, capillary tubes), and Schrader valves. It is formulated to remain compatible with oils and most materials used in modern HVAC equipment, allowing regular maintenance and repairs to continue.

• Safe with manifold gauges, hoses, and service tools
• Compatible with common system oils and expansion devices
• Does not require special tools for later servicing

Who this is for: Leak Saver is intended for HVAC professionals, maintenance technicians, and experienced DIYers who need a fast, non-invasive way to address small refrigerant leaks in residential, light commercial, and automotive systems (excluding ammonia systems). It’s ideal when the system retains most of its charge, when quick return-to-service is important, or as a preventative measure to protect against future small leaks.